12154324021220 has 12 divisors (see below), whose sum is σ = 25524080444604. Its totient is φ = 4861729608480.

The previous prime is 12154324021157. The next prime is 12154324021261. The reversal of 12154324021220 is 2212042345121.

It can be written as a sum of positive squares in 2 ways, for example, as 2857154657344 + 9297169363876 = 1690312^2 + 3049126^2 .

It is a super-2 number, since 2×12154324021220² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 303858100511 + ... + 303858100550.

It is an arithmetic number, because the mean of its divisors is an integer number (2127006703717).

Almost surely, 2^{12154324021220} is an apocalyptic number.

12154324021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12154324021220 is an abundant number, since it is smaller than the sum of its proper divisors (13369756423384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12154324021220 is a wasteful number, since it uses less digits than its factorization.

12154324021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 607716201070 (or 607716201068 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 29.

Adding to 12154324021220 its reverse (2212042345121), we get a palindrome (14366366366341).

The spelling of 12154324021220 in words is "twelve trillion, one hundred fifty-four billion, three hundred twenty-four million, twenty-one thousand, two hundred twenty".